I got back from the show a couple of hours ago and have been looking over my purchases. Most of what I bought was pretty inexpensive, a lot of Kennedy proofs that I needed to fill an album. I did not bother haggling over price on the lower cost coins. When I was looking over some Franklins at another dealer's booth, he told me to not pay attention to the prices on the coins, and to just let him know what I was interested in. I ended up buying Franklins from 1960 to 1963 of both mint marks, as well as the Kennedy with Accented Hair. I asked what he could do, and I felt the discount he gave me was pretty good. Overall, I have to say that I was pretty happy with the prices. There was one dealer who was priced really high and I noticed that his booth wasn't getting a lot of attention. He was a nice guy and I felt sorry for him not getting more business, but maybe there's a reason for it. I had the feeling that it was a buyers market. The biggest single purchase that I made was the Kennedy with Accented Hair. The dealer gave it a grade of PR67 and I paid $30 for it.
I am like you in that I typically do no carry a lot of cash and use my debit card for most transactions. The coin show that I attended was on a cash basis, though I did see some people writing checks. I did not see a single booth set up for credit or debit cards. As far as security, I felt pretty safe. I have lived in some rough neighborhoods in my life, so I have developed a pretty good skill of being aware of my surroundings. There was nothing that gave me the slightest feeling of being in danger. Now, If I were a dealer carrying around all that cash and coins, yes I would want some security. The entire atmosphere at the show was very friendly and laid back. I know this doesn't assure that something won't happen, but it didn't look like a very dangerous crowd to say the least.